Delete memory mode "map" and "save". (#16604)

* Delete memory modes "map" and "save".

* Remove unmaintained exporting tests

* Remove references of map/save modes in docs.

* Remove more references to map/save from docs.

1 files changed, 6 insertions, 9 deletions

diff --git a/streaming/README.md b/streaming/README.md
index 03de090e02..153286e5fb 100644
--- a/streaming/README.md
+++ b/streaming/README.md
@@ -52,8 +52,8 @@ node**. This file is automatically generated by Netdata the first time it is sta
 |-----------------------------------------------|----------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `enabled`                                     | `no`     | Whether this API KEY enabled or disabled.                                                                                                                                                                                                      |
 | [`allow from`](#allow-from)                   | `*`      | A space-separated list of [Netdata simple patterns](https://github.com/netdata/netdata/blob/master/libnetdata/simple_pattern/README.md) matching the IPs of nodes that will stream metrics using this API key. [Read more →](#allow-from) |
-| `default history`                             | `3600`   | The default amount of child metrics history to retain when using the `save`, `map`, or `ram` memory modes.                                                                                                                                     |
-| [`default memory mode`](#default-memory-mode) | `ram`    | The [database](https://github.com/netdata/netdata/blob/master/database/README.md) to use for all nodes using this `API_KEY`. Valid settings are `dbengine`, `map`, `save`, `ram`, or `none`. [Read more →](#default-memory-mode)          |
+| `default history`                             | `3600`   | The default amount of child metrics history to retain when using the `ram` memory mode.                                                                                                                                     |
+| [`default memory mode`](#default-memory-mode) | `ram`    | The [database](https://github.com/netdata/netdata/blob/master/database/README.md) to use for all nodes using this `API_KEY`. Valid settings are `dbengine`, `ram`, or `none`. [Read more →](#default-memory-mode)          |
 | `health enabled by default`                   | `auto`   | Whether alerts and notifications should be enabled for nodes using this `API_KEY`. `auto` enables alerts when the child is connected. `yes` enables alerts always, and `no` disables alerts.                                                   |
 | `default postpone alarms on connect seconds`  | `60`     | Postpone alerts and notifications for a period of time after the child connects.                                                                                                                                                               |
 | `default health log history`                  | `432000` | History of health log events (in seconds) kept in the database.                                                                                                                                                                                |
@@ -128,16 +128,13 @@ To allow all IPs starting with `10.*`, except `10.1.2.3`:
 
 #### `default memory mode`
 
-The [database](https://github.com/netdata/netdata/blob/master/database/README.md) to use for all nodes using this `API_KEY`. Valid settings are `dbengine`, `ram`,
-`save`, `map`, or `none`.
+The [database](https://github.com/netdata/netdata/blob/master/database/README.md) to use for all nodes using this `API_KEY`.
+Valid settings are `dbengine`, `ram`, , or `none`.
 
 - `dbengine`: The default, recommended time-series database (TSDB) for Netdata. Stores recent metrics in memory, then
   efficiently spills them to disk for long-term storage.
 - `ram`: Stores metrics _only_ in memory, which means metrics are lost when Netdata stops or restarts. Ideal for
   streaming configurations that use ephemeral nodes.
-- `save`: Stores metrics in memory, but saves metrics to disk when Netdata stops or restarts, and loads historical
-  metrics on start.
-- `map`: Stores metrics in memory-mapped files, like swap, with constant disk write.
 - `none`: No database.
 
 When using `default memory mode = dbengine`, the parent node creates a separate instance of the TSDB to store metrics
@@ -149,7 +146,7 @@ cache size` and `dbengine multihost disk space` settings in the `[global]` secti
 | Setting                                    | Default           | Description                                                                                                                                                                                                                                                                                                                |
 |--------------------------------------------|-------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `[global]` section                         |                   |                                                                                                                                                                                                                                                                                                                            |
-| `memory mode`                              | `dbengine`        | Determines the [database type](https://github.com/netdata/netdata/blob/master/database/README.md) to be used on that node. Other options settings include `none`, `ram`, `save`, and `map`. `none` disables the database at this host. This also disables alerts and notifications, as those can't run without a database. |
+| `memory mode`                              | `dbengine`        | Determines the [database type](https://github.com/netdata/netdata/blob/master/database/README.md) to be used on that node. Other options settings include `none`, and `ram`. `none` disables the database at this host. This also disables alerts and notifications, as those can't run without a database. |
 | `[web]` section                            |                   |                                                                                                                                                                                                                                                                                                                            |
 | `mode`                                     | `static-threaded` | Determines the [web server](https://github.com/netdata/netdata/blob/master/web/server/README.md) type. The other option is `none`, which disables the dashboard, API, and registry.                                                                                                                                        |
 | `accept a streaming request every seconds` | `0`               | Set a limit on how often a parent node accepts streaming requests from child nodes. `0` equals no limit. If this is set, you may see `... too busy to accept new streaming request. Will be allowed in X secs` in Netdata's `error.log`.                                                                                   |
@@ -182,7 +179,7 @@ default `dbengine` as specified by the `API_KEY`, and alerts are disabled.
 
 [MACHINE_GUID]
     enabled = yes
-    memory mode = save
+    memory mode = ram
     health enabled = no
 ```